Sensor employing a sliding magnet suspended on ferrofluid

Details Sensor employing a sliding magnet suspended on ferrofluid Sensor employing a sliding magnet suspended on ferrofluid

1997-02-11

1998-07-14

Brock, Michael

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

7351431, 33366, G01P 1508

Patent

active

057807418

ABSTRACT:
A ferrofluid sensor assembly includes a permanent magnet which is supported in a hermetically-sealed housing by ferrofluid rings at each end of the magnet. However, the housing is large enough that the ferrofluid rings do not seal the end of the magnet against the walls of the housing. The housing is filled with a non-magnetic liquid that is immiscible with the ferrofluid. The nonmagnetic liquid wets the walls of the housing such that the ferrofluid rides on the thin film of the nonmagnetic liquid. The non-magnetic fluid is selected to have low viscosity, so that the magnet has a fast response time.

REFERENCES:
patent: 4667414 (1987-05-01), Russell
patent: 4706498 (1987-11-01), Nemnich et al.
patent: 4922753 (1990-05-01), Idogaki et al.
patent: 5452520 (1995-09-01), Raj et al.

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